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    1. The 68kMLA Forum Rules   (10147 visits to this link)

      To quote vintage Apple manuals: "Read Me First!"

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    1. General 68kMLA News & Stuff

      What's going down in the barracks.

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    2. Conquests

      Discuss your latest vintage Mac finds!

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    3. Trading Post

      Feel free to trade all of your Mac goodies here with all honest intentions. The website provider assumes NO liability, so buyer beware! Please see this topic for more information.

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  3. Projects & Hosted Forums

    1. RetroChallenge

      What can you do given only one month and strictly "retro" hardware? Find out with RetroChallenge!
      http://retrochallenge.org/

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    2. 68kMLA Wiki

      The creation and maintenance of the 68kMLA's information repository.
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  4. 68k Model Forums

    1. Compact Mac

      Macintosh, 512k, SE, etc.

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    2. Mac II, Quadra & Centris

      Just think, having a Quadra 950 in 1992 would be like having a Mac Pro today… except with more slots, more expandability, and on-board SCSI!

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    3. 68k LC & Performa

      Ah, the consumer computers!

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    4. 68k PowerBook

      From the Portable to the 190cs.

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  5. PowerPC Model Forums

    1. NuBus Power Mac, LC & Performa

      The NuBus architecture gets a new brain!

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    2. PCI Power Mac & Performa

      The PPC comes of age and adopts the industry standard expansion slot.

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    3. G3/G4/G5 Power Mac, iMac & eMac

      From the Beige G3 to the quad-core G5, via various iMacs!

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    4. PPC PowerBook & iBook

      All that power in a laptop? Never…

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  6. Everything Else…

    1. Apple I, ][, /// & Lisa

      Not really 68k Macs, but certainly Vintage!

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    2. Newton

      The best PDA ever finally gets its own forum!

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    3. Software

      Includes system stuff, productivity, emulation, design, and games for pre-OS X Macs!

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    4. Hacks & Development

      Yes, it's back! Hardware hacks/modifications and software development for Mac OS.

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    5. Peripherals

      Anything you can hook up to your Mac or stuff into it as an interface!

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  • Posts

    • I think that big heatsink is attached to a power transistor.   I didn't check the little board on the back of the CRT. I'm taking note to check it next time.
    • What mounts on that big heatsink you are heating?    I guess you have already looked at the back of the CRT under the sheet of white plastic covering the solder side of the small board? I just found two cracked joints on mine that were the cause of a problem I was sure was on the analog board.
    • Got the proper mouse for it!     It’s the correct one with the squared connector end. The newer ones work, but having this one makes me feel better!     I’m amazed how usable this machine really is. I wasn’t sure if a 512 would be really limited to use or not, and it most certainly isn’t! Pretty much everything I have tried so far works fine on it.  Incredible what all you can do with 512KB!
    • In an effort to nail down a potential replacement SWIM for my 5120, I began looking at SWIMs on other boards of a similar vintage. I have narrowed down the potential options to: 344S1029: the direct replacement, what I pulled off my 5120 344S1029-A: seen on 5126, PB100, 140, 170 343S1029-A: seen on PB100, 140, 170, 145B, 165, 180c (and I assume all others prior to the 150).   The SE/30, IIvi, LC, LCII, Classic, IIsi etc. all use the 344S0061-A, which is also PLCC-44 like the above but I'm not sure if they would be suitable as a replacement if power is a factor. My understanding is that SWIM is 100% backward compatible, even with IWC... and seeing that the PB100 / 140 / 170 are seen with two versions of the SWIM, one of those versions is found on the 5126, I'm venturing that early PB SWIMs would work just fine as a replacement on the 5120.   Does anyone have any specific knowledge about this? I haven't been able to find anything in search.
    • Good afternoon folks. I recently picked up a dead IIx. It wouldn't even bumpstart when I first saw it, but I'm not sure why as it sort of did once I got it home (it chimed and showed the happy mac before doing a weird restart with no chime - after a couple of times it froze). Note that it does not restart if there is no disks connected. Additionally, the video is pale and washed out, except once in a while when it is normal.   It is now a couple of weeks later and I've spent the weekend researching and repairing. I've fixed 6 broken traces and checked lots more in the power circuit. I've re-capped most of the motherboard (I don't have a replacement for the yellow 10uF or the axial 220uF (might have the value wrong - it almost faces the board!). The power on circuit now works from ADB and the button on the back.   Machine is a late variant (March 1990) and has a soldered CPU and factory battery holders (no funny little board or capacitor). 8mb of RAM, Radius 24 Pro XK, ethernet and a 540mb disk. At some point someone had a Radius Rocket in it, but sadly that is gone.   Does anyone have any suggestions for what might be wrong? I don't know the machine's history so it could even have the wrong RAM fitted for all I know.   Issue summary: 1. Restarts silently without an error while showing the Happy Mac. 2. Video is washed out.   Youtube video for reference :   https://youtu.be/Dca4S1n8_VI  
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